The term 'overly optimistic' can be described by the crossword solutions of 'ROSEATE' (7 letters), 'ROSY' (4 letters) and 'rosecolored' (11 letters). ROSEATE is an adjective that means having a cheerful or optimistic outlook, while ROSY is an adjective that means having a bright or cheerful outlook. Rosecolored is an adjective that means having an overly optimistic outlook. All three words describe someone who is overly optimistic in their outlook on life.